Biology
Write the important roles of the following :
(a) Rectum
(b) Gastric juice
(c) Epiglottis
(d) Small intestine
(e) Tongue
Digestive System
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Answer
(a) Rectum temporarily stores undigested food and wastes, to be defaecated through the anus.
(b) Gastric juice plays two key roles (i) it kills any germs which may have entered along with the food (ii) it activates pepsinogen to act on proteins.
(c) Epiglottis closes the opening of wind pipe.
(d) Most of the digestion and absorption of nutrition occur in small intestine.
(e) Tongue helps in mixing of food in buccal cavity and pushes it through pharynx.
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